sureYnot,
You are correct, Methanol will blind you and kill you. For many years, Methanol was used in Ethanol, to discourage people drinking it and was called Methylated Spirits, or Metho.
After many that were addicted to Ethanol, went blind, and had died from poisoning, it was decided by our lawmakers, that other deterrents should be used, like Bittrex, and Iso-Propanol.
These mixtures were the sold as denatured Alcohol or continued to be called Methylated Spirits. Other denaturants were Butanol which gave a strange odour to the Ethanol.
These newer denatured alcohols, are now used in home made drinks, as a cheap source of Ethanol, but they will all make user sick, (not Blind), and die a slower way.
Because of the nature of these mixtures, it is very difficult to purify the denatured Ethanol that will make it more suitable for drinking.